New words：
hydrogen [ˈhaɪdrədʒən] n. 氢；氢气
hydrogen gas 氢气
Sample Sentences：
Water is composed of hydrogen and oxygen. Hydrogen is the lightest gas in the universe.
When hydrogen burns in air, it produces water.
compose [kəmˈpoʊz] v.组成；
New words：
analysis [əˈnæləsɪs] n.分析；分析结果
Sample Sentences：
My teacher asked us to write an analysis of the story.
She did a detailed analysis of the experiment results.
The blood samples are sent to the laboratory for analysis.
New words：
analyze [ˈænəlaɪz] v.分析；分解analyse [ˈænəlaɪz] v.分析；分解
Sample Sentences：
The job involves gathering and analysing data.
We can analyse water into oxygen and hydrogen.
We should analyze the cause and effect of this event.
We should analyse what they said and not just agree with everything.
hydrogen [ˈhaɪdrədʒən] n. 氢；氢气
New words：
accountant [əˈkaʊntənt] n. 会计；会计师
Sample Sentences：
Do you want to be an accountant when you grow up?
Our company plans to hire a new accountant to handle taxes this year.
Good accountants must be good with numbers and pay attention to details.
New words：
access [ˈækˌses]
v.进入；访问，存取(计算机文件)
n.通道；入口；入径
Sample Sentences：
You need a password to get access to the computer system.
The only access to that ancient castle is along a muddy track.
This scientist accessed enormous different files to find the correct information.